In the context of marking, guidelines typically include criteria such as clarity, relevance, quality of arguments, adherence to the assignment's requirements, originality, and grammar. A guideline that does not serve in the marking process might be something irrelevant to the evaluation criteria or subjective preference, such as a personal opinion about the student's character or previous performance that does not pertain to the specific work being assessed.
If you have specific options or examples in mind, I could provide a more precise answer!
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